CHANNEL AS 9J2678 - Caterpillar

START BY:a. remove oil pump 1. Check each main bearing cap (2) for its location on the engine. Each cap has an arrow (1) to show the front of the block and a number (3) which gives the location of that cap.2. Remove No. 2 through No. 4 main bearing caps from the engine. Remove the lower bearings from the caps.3. Remove the thrust plate from each side of the No. 3 upper main bearing. 4. Turn the crankshaft until tool (A) can be installed in oil hole (4). Turn the crankshaft in the direction which will push the upper main bearing out, tab end first.
If the crankshaft is turned in the wrong direction, the tab of the bearing will be pushed between the crankshaft and the cylinder block. This will cause damage to the crankshaft and block.
Install the connecting rod bearings dry when the clearance checks are made. Put clean oil on the connecting rod bearings for final assembly. 5. Install lower bearings in the bearing caps.6. Install upper bearings in the cylinder block with tool (A). Be sure tab (5) on the back of the bearings fits in the groove of the caps and cylinder block. When the bearing clearance is checked, the crankshaft will have to be lifted up against the upper halves of the main bearings and held to get a measurement with Plastigage (B). The Plastigage will not hold the weight of the crankshaft. See the topic Install Crankshaft for service tips on the use of Plastigage (B).7. Check the bearing clearance with tool (B) as follows:a. Put tool (B) in position on the surface of the lower main bearing. do not turn the crankshaft when Plastigage (B) is in position.b. Put 2P2506 Thread Lubricant on the threads of the cap bolts. Install the caps and cap bolts, finger tight.c. Tighten the bolts on the tab end of the caps first to a torque of 260 14 N m (190 10 lb.ft.).
Do not use an impact wrench to tighten the bolts the additional 120°.
d. Put a mark across the bolt head and cap. Tighten the bolts opposite the tab end 120°. Tighten the bolts on the tab end of the cap 120° more. Make sure the main bearing caps are installed with their identification number (7) in alignment with the identification number on the left side of the cylinder block and arrow (6) toward the front of the block.8. Remove the main bearing caps and tool (B).9. Measure the thickness of the Plastigage to determine the bearing clearance. The clearance for new bearings must be 0.091 to 0.186 mm (.0036 to .0073 in.). the maximum clearance for used bearings is 0.25 mm (.010 in.).10. Install a thrust plate (8) on each side of the No. 3 upper bearing. Install the thrust plates with the side marked "BLOCK SIDE" toward the cylinder block.11. Install No. 2 through No. 4 main bearing caps.Follow the procedure in Step 7 to tighten the bolts.12. Do